A Billiard Ball Computer is is a computer based in the Billiard ball model, that can
be simulated with the Margolus neighborhood. I have built the AND gate shown
in the page: ( It is rotated 45 degrees )

Unfortunately, a NOT gate should be impossible, because BBM is conservative (the number of white dots never change), and that would require something like a billiard ball gun. Not really! We can use another notation for representing numbers, where a single signal can represent a continuos stream of bits. Example: